diff --git a/book.js b/book.js
index 67a8a5b0..351e28c7 100644
--- a/book.js
+++ b/book.js
@@ -346,7 +346,7 @@ function playground_text(playground, hidden = true) {
         }
 
         setTimeout(function () {
-            themeColorMetaTag.content = getComputedStyle(document.body).backgroundColor;
+            themeColorMetaTag.content = getComputedStyle(document.documentElement).backgroundColor;
         }, 1);
 
         if (window.ace && window.editors) {
diff --git a/css/general.css b/css/general.css
index 344b53eb..a6db6805 100644
--- a/css/general.css
+++ b/css/general.css
@@ -5,6 +5,7 @@
 :root {
     /* Browser default font-size is 16px, this way 1 rem = 10px */
     font-size: 62.5%;
+    color-scheme: var(--color-scheme);
 }
 
 html {
diff --git a/css/print.css b/css/print.css
index 5e690f75..27d05e92 100644
--- a/css/print.css
+++ b/css/print.css
@@ -22,14 +22,6 @@
     overflow-y: initial;
 }
 
-code {
-    background-color: #666666;
-    border-radius: 5px;
-
-    /* Force background to be printed in Chrome */
-    -webkit-print-color-adjust: exact;
-}
-
 pre > .buttons {
     z-index: 2;
 }
diff --git a/css/variables.css b/css/variables.css
index 21bf8e55..59fcda88 100644
--- a/css/variables.css
+++ b/css/variables.css
@@ -50,6 +50,8 @@
     --searchresults-border-color: #888;
     --searchresults-li-bg: #252932;
     --search-mark-bg: #e3b171;
+
+    --color-scheme: dark;
 }
 
 .coal {
@@ -90,6 +92,8 @@
     --searchresults-border-color: #98a3ad;
     --searchresults-li-bg: #2b2b2f;
     --search-mark-bg: #355c7d;
+
+    --color-scheme: dark;
 }
 
 .light {
@@ -130,6 +134,8 @@
     --searchresults-border-color: #888;
     --searchresults-li-bg: #e4f2fe;
     --search-mark-bg: #a2cff5;
+
+    --color-scheme: light;
 }
 
 .navy {
@@ -170,6 +176,8 @@
     --searchresults-border-color: #5c5c68;
     --searchresults-li-bg: #242430;
     --search-mark-bg: #a2cff5;
+
+    --color-scheme: dark;
 }
 
 .rust {
@@ -210,6 +218,8 @@
     --searchresults-border-color: #888;
     --searchresults-li-bg: #dec2a2;
     --search-mark-bg: #e69f67;
+
+    --color-scheme: light;
 }
 
 @media (prefers-color-scheme: dark) {